Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
Thin-film organic solar cells (OSCs) have received significant attention due to the advantages of light-weight, flexibility, low cost, and facile fabrication of roll-to-roll processing.[1] However, there are three key issues that have to be considered carefully for future practical applications: high power conversion efficiency (PCE), good processability and long-term stability.[2] In this work, we designed and synthesized three small molecules, namely BDTT- TR (meta-alkthienyl), BDTT-O-TR (meta-alkoxy-thienyl) and BDTT-S-TR (meta-alkylthio-thienyl), to systematically elucidate the effects of alkyl side chains on the relevant device properties. Although these three molecules show the similar molecular structure, thermal property and optical band gap, the introduction of meta-alkylthio-thienyl-substituted BDT as the central unit in the molecular backbone substantially results in the higher absorption coefficient, lower highest occupied molecular orbital (HOMO) level and more efficient and balanced charge transport property in BDTT-S-TR system. Combining with the investigations of morphological characteristics and carrier recombination mechanisms in BHJ blends, BDTT-S-TR device has been strongly demonstrated that it possesses a higher power conversion efficiency (PCE) of 9.20% as compared to the other two systems (7.44% for BDTT-TR and 6.50% for BDTT-O-TR). In addition, the influence of active layer thicknesses on device performance has been investigated for further assessing these molecules for possible large-scale production. Finally, the thermal stability of blend morphology and light-induced degradation in devices are also investigated. Our aim is to provide a comprehensive summary insight into the structure-property interrelationship, meanwhile underline the effects of defined molecular structures that represent the observed trade-offs in device efficiency and blend processability as well as the relevant stability.
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.
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